Free BigCommerce Scanner
Free BigCommerce Store Speed Test
BigCommerce provides solid infrastructure, but theme customisations and third-party integrations can still slow things down. PageDiag identifies exactly where.
What We Analyse
Performance
Page speed directly affects sales - we measure every metric that impacts conversions
SEO
Everything that determines whether Google shows your store to potential customers
Accessibility
How usable your store is for everyone - including the 15% of users with disabilities
Common BigCommerce Performance Issues
- 1Heavy theme JavaScript bundles
- 2Third-party payment and review widgets blocking render
- 3Unoptimised product images
- 4Missing Open Graph tags on category pages
- 5Slow custom Stencil template rendering
- 6Excessive DOM size from complex product pages
BigCommerce Speed Optimisation Tips
- ✓Optimise Stencil templates to reduce DOM complexity
- ✓Compress and lazy-load product images
- ✓Audit third-party scripts and defer non-essential ones
- ✓Use BigCommerce's built-in CDN effectively
- ✓Add structured data for products and reviews
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